Drying drum



March 25, 1924. 11,487,893

G. SAUBER DRYING DRUM Filed Aug. 24. 1921 Wm? a I Jaye/@501" gear? Jaaev? 6W 1 Jaw! Patented Mar. 25,192d.

entree stares instant earner estates.

GEORG SAUBER, OF UERDINGEN-ON-THE-RHINE, GERMANY, ASSIGNOR TO THE FIRM 51; AKTIENGESELWCHAFT, OE 'UERDINGEN ON-THE-BHINE, GER- DRYINQ DRUM.

Application filed August 24, 1921.

w 1919; Norway, Nov. 26, 1919; Holland, Nov.

19, 1919; Czechoslovakia, Dec. 23, 1919), of which the following is a specification.

There have already become known drying drums in which a set of chambers is formed by means of longitudinal partitions so that the material to be dried flows from one chamber into the other over the longitudinal edges of said partitions. According to another form of construction lifting blades are arranged upon the inner surface of the drum, the material to be dried being thus also lifted so that it drops upon the lower blades assing through the free inner space of the rum.

It has already been proposed to indent the edges of the blades and partitions to obtain a larger surface of contact between the material to be dried and the heating gases. In this manner the material to be dried is made to flow in cascades in thin sheets through the drum but only in the longitudinal direction so that between the difierent sheets of material remain free spaces through which the heatin gases pass without efi'ect upon the materia It has further been pro posed to use the movement in cascades of the material to be dried in such drying drums where the heating gases flow in transverse direction through the drum, but in this case also a large part of the heating gases flows through the spaces between the cascades without being utilized.

This invention has for its object a con' struction of the drying drum which is improved so that no free spaces remain between the sheets of material in the direction in which the heating gases flow.

With this object in View the lifting blades or bafliing plates have narrow transverse slots alternatingly arranged at short distances a art. When the material to be dried moves orward it fiowsthrough these slots in a direction perpendicular to the axis of the drum and in thin sheets so that disc- Serial Ito. 494,9ll9.

like sheets are formed which together cover the cross section of the drum succeeding each other in multiple re etition so that the heating gases are force to traverse these sheets of material. In this manner all the heating gases are fully utilized and a more economical working or the apparatus is obtamed than with the apparatus of known construction.

In the accompanying drawing two forms of construction of the apparatus are shown by way of example in cross section and in longitudinal section, the direction of rota- @1011 being indicated by arrows.

- Fig. is a cross section of a drying drum embodying one form of the invention. Fig. 2 1s a fragmentary longitudinal section on the line 22 of Fig. 1. Fig.3 is a cross section of a drying drum embodying another form of the invention. Fig. 4 is a fragnentary longitudinal section of Figure In the partitions of the drum according to the first form of construction and in the lifting lates of the drum according to the secon orm of construction slots 0 are arranged which stand transversely to the longitudinal direction of said partitions and plates. 'Ihese slots succeed each other at short distances and each slot is comparatively small. Thus are formed the thin transverse sheets of material shown in the drawing which together cover the cross section of the drum; the material flows of course also over the longitudinal edge of the partitions or plates (cfr. at a).

In order to avoid great heights of fall and to ensure the careful treatment of material which is easily damaged it is advisable, particularly if partitions are used as shown in Figs. 1 and 2, to make the slots 0 in the partitions alternate (cfr. the longitudinal section). As shown in Fi ures 3 and 4 the lifting blades (cfr. o) in ifi'erent compartments alternate with regard to one another.

In open drums with single lifting blades upon t e inner wall part of'the upper cross section of the drum remains free of material to be dried, one art of the lower cross section being filled with material. In order to avoid that the heatin gases flow through this free space of the rum without being utilized, several rings (1 of sheet metal are arranged, according to this invention, in the annular space formed by the, U V

die. to the direction-1n which the heating gases said rings do not make'narrower the-mid main passage within the ring formed by the lifting blades but the serve to prevent, that conslderable parts 0 the heating ases flow outside said annular space. .It'lS; ow-

ever advisable to allow somefpartof the heating ases to flow through thisi-outer space an for thisreason the rin are not arranged in close proximity of t e' nner wall of the drum.

It will be understood that the rotatable drums embodying the forms of invention above described will be arranged at a slight inclination to cause the material to 'travel from end to end thereof, as is customary in drums of this type.

I claim 1. An im roved drying drum for the formation of t sheets of material to be dried, comprising a rotatable drum having longitudinally arranged lifting members fixed therein, each of said members having a plurality of narrow transverse slots through which the material flows in thin sheets at right angles to the direction in which the heating gases flow through said drum.

2. An im roved drying drum for the formation of t sheets of material to be dried,

comprisin a rotatable drum having a plurality of 'fting plates extending from the 'inner eriphery thereof inwardly, each of said ates having a number of closely spac transverse slots through which the material flows in. thin sheets at right angles flow through said drum.

3. improved drying drum comprising a rotatable drum having a lurality of lifting members fixed to the inner periphery thereof, said members being constructed and arranged tocause the material lifted thereby to flow in thin sheets at right angles to the direction in which the heating gases flow through said drum. 5

4. An improved drying drum with partitions or lifting blades for the formation of thin sheets of material to be dried, comprising, in combination with the rotatable drum, partitions arranged in the longitudinal direction of the drum having narrow trans verse slots at short distances a art through which the drying material ows' in thin sheets at right angles to the direction in which the heating gases flow through said drum, rings of sheet metal-near the mantel of the drum standing transversely to said lifting blades and forming an obstacle to the heating gases near the mantle of the drum and forcing them to flow through the middle part and consequently through the sheets 0 material. In testimony whereof I aflix my signature in presence of two witnesses.

GEORG SAUBER. Witnesses:

ARTHUR Cononr, Go'rrLraB TUV,ISOH. 

